Couldn't live without A/C, any more than I could live without heat. We set ours at 76 in summer and are perfectly comfortable. We have geothermal so A/C is pretty much free, except for the fan on the furnace. That doesn't mean we don't get a power bill though..........we have a pool pump, lights, dryer, etc. and are on a rural coop. Heat in the winter is propane, so it is set at 70 and we may wear a sweater. Works for us. Everyone has a different tolerance. Our DIL melts at 72; my mom who is 92 freezes at 76.